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2. Diamond (gemstone) - Wikipedia

   en.wikipedia.org/wiki/Diamond_(gemstone)

   In October 2020, a population of diamonds were discovered within an alluvial deposit at the Ellendale diamond field in Australia that exhibit an ultra rare purple fluorescence. Some diamonds with "very strong" fluorescence can have a "milky" or "oily" look to them, but they are also very rare and are termed "over-blues."

3. Material properties of diamond - Wikipedia

   en.wikipedia.org/wiki/Material_properties_of_diamond

   Some natural type IIb diamonds phosphoresce blue after exposure to short-wave ultraviolet. In natural diamonds, fluorescence under X-rays is generally bluish-white, yellowish or greenish. Some diamonds, particularly Canadian diamonds, show no fluorescence. [19] [22] The origin of the luminescence colors is often unclear and not unique.

4. Spontaneous parametric down-conversion - Wikipedia

   en.wikipedia.org/wiki/Spontaneous_parametric...

   Schematic of SPDC process. Note that conservation laws are with respect to energy and momentum inside the crystal.. Spontaneous parametric down-conversion (also known as SPDC, parametric fluorescence or parametric scattering) is a nonlinear instant optical process that converts one photon of higher energy (namely, a pump photon) into a pair of photons (namely, a signal photon, and an idler ...

5. Diamond simulant - Wikipedia

   en.wikipedia.org/wiki/Diamond_simulant

   A diamond simulant, diamond imitation or imitation diamond is an object or material with gemological characteristics similar to those of a diamond. Simulants are distinct from synthetic diamonds , which are actual diamonds exhibiting the same material properties as natural diamonds.

6. Tracy Hall - Wikipedia

   en.wikipedia.org/wiki/Tracy_Hall

   Hall produced synthetic diamond in a press of his own design [2] on December 16, 1954, and showed that he and others could repeat the process following Hall's procedure, a success which led to the creation of a major supermaterials industry. Hall was one of a group of about a half dozen researchers who had focused on achieving the synthesis for ...

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